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  • American Geophysical Union (AGU)  (47)
  • English  (47)
  • 1
    Online Resource
    Online Resource
    Observations of Ice Nucleating Particles in the Free Troposphere From Western US Wildfires
    American Geophysical Union (AGU) ; 2021
    In:  Journal of Geophysical Research: Atmospheres Vol. 126, No. 3 ( 2021-02-16)
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 126, No. 3 ( 2021-02-16)
    Abstract: Wildfires are sources of ice‐nucleating particles (INPs) to the free troposphere INP compositions from sampled wildfires were dominated by organics Contributions of tar ball composition INPs evidenced a secondary formation mechanism
    Type of Medium: Online Resource
    ISSN: 2169-897X , 2169-8996
    URL: Article
    DOI: 10.1029/2020JD033752
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2021
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  • 2
    Online Resource
    Online Resource
    Pieces of the ancient lunar crust: Ages and composition of clasts in consortium breccia 67915
    American Geophysical Union (AGU) ; 1983
    In:  Journal of Geophysical Research: Solid Earth Vol. 88, No. S01 ( 1983-11-10)
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 88, No. S01 ( 1983-11-10)
    Abstract: We discuss the composition and chronology of clasts representing three minor lithologies in consortium breccia 67915. The lithologies studied are: sodic ferrogabbro, pristine troctolitic anorthosite (67915,26), and granulitic troctolitic anorthosite (67915,67). These lithologies were presumed to represent samples of the ancient lunar crust. The pristine troctolitic anorthosite, a typical member of the pristine anorthosite suite, contains little or no trapped liquid consistent with its two‐phase mineralogy. The plagioclase separates have 39 Ar‐ 40 Ar plateau ages of 4.10±0.06 b.y., and a final rise in the age pattern may represent a ‘memory’ of the earlier evolution. The granulitic troctolitic anorthosite, which has 13 times larger REE abundances, displays a continuous rise of the 40 Ar/ 39 Ar ratio. The last 25% of the 39 Ar release data establish a minimum age of 〉 3.5 b.y., but the 244 Pu/Nd chronology suggests an age of ∼4.3 b.y. The sodic ferrogabbro samples, which appear to be members of the Mg‐gabbronorite group of pristine rocks, show large Ar losses but indicate plateaus in the low‐temperature data, suggesting a metamorphic event more recently than 260 m.y. ago, a time that is consistent with the North Ray impact event 50 m.y. ago.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB088iS01p0B165
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1983
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  • 3
    Online Resource
    Online Resource
    SWICS/Ulysses observations: The three-dimensional structure of the heliosphere in the declining/minimum phase of the solar cycle
    American Geophysical Union (AGU) ; 1997
    In:  Geophysical Research Letters Vol. 24, No. 22 ( 1997-11-15), p. 2885-2888
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 24, No. 22 ( 1997-11-15), p. 2885-2888
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/97GL01605
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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    detail.hit.zdb_id: 7403-2
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  • 4
    Online Resource
    Online Resource
    Concentration of interstellar pickup H + and He + in the solar wind
    American Geophysical Union (AGU) ; 1994
    In:  Geophysical Research Letters Vol. 21, No. 14 ( 1994-07-01), p. 1565-1568
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 21, No. 14 ( 1994-07-01), p. 1565-1568
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/94GL01288
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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    detail.hit.zdb_id: 7403-2
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  • 5
    Online Resource
    Online Resource
    Pa 231 /Th 230 dating and O 18 /O 16 temperature analysis of core A254-BR-C
    American Geophysical Union (AGU) ; 1962
    In:  Journal of Geophysical Research Vol. 67, No. 7 ( 1962-07), p. 2907-2911
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 67, No. 7 ( 1962-07), p. 2907-2911
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JZ067i007p02907
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1962
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  • 6
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    Solar wind measurements with SOHO: The CELIAS/MTOF proton monitor
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Space Physics Vol. 103, No. A8 ( 1998-08), p. 17205-17213
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 103, No. A8 ( 1998-08), p. 17205-17213
    Abstract: The proton monitor, a small subsensor in the Charge, Element, and Isotope Analysis System/Mass Time‐of‐Flight (CELIAS/MTOF) experiment on the SOHO spacecraft, was designed to assist in the interpretation of measurements from the high mass resolution main MTOF sensor. In this paper we demonstrate that the proton monitor data may be used to generate reasonably accurate values of the solar wind proton bulk speed, density, thermal speed, and north/south flow direction. Correlation coefficients based on comparison with the solar wind measurements from the SWE instrument on the Wind spacecraft range from 0.87 to 0.99. On the basis of the initial 12 months of observations, we find that the proton momentum flux is almost invariant with respect to the bulk speed, confirming a previously published result. We present observations of two interplanetary shock events, and of an unusual solar wind density depletion. This large density depletion, and the correspondingly large drop in the solar wind ram pressure, may have been the cause of a nearly simultaneous large increase in the flux of relativistic magnetospheric electrons observed at geosynchronous altitudes by the GOES 9 spacecraft. Extending our data set with a 10‐year time span from the OMNIWeb data set, we find an average frequency of about one large density depletion per year. The origin of these events is unclear; of the 10 events identified, 3 appear to be corotating and at least 2 are probably CME related. The rapidly available, comprehensive data coverage from SOHO allows the production of near‐real time solar wind parameters that are now accessible on the World Wide Web.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/97JA02770
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    detail.hit.zdb_id: 161665-1
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  • 7
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    Online Resource
    Acceleration of interstellar pickup ions in the disturbed solar wind observed on Ulysses
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Space Physics Vol. 99, No. A9 ( 1994-09), p. 17637-17643
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 99, No. A9 ( 1994-09), p. 17637-17643
    Abstract: Acceleration of interstellar pickup H + and He + as well as of solar wind protons and alpha particles has been observed on Ulysses during the passage of a corotating interaction region (CIR) at ∼4.5 AU. Injection efficiencies for both the high thermal speed interstellar pickup ions (H + and He + ) and the low thermal speed solar wind ions (H + and He ++ ) are derived using velocity distribution functions of protons, pickup He + and alpha particles from 〈 1 to 60 keV/ e and of ions (principally protons) above ∼60 keV. The observed spatial variations of the few keV and the few hundred keV accelerated pickup protons across the forward shock of the CIR indicate a two stage acceleration mechanism. Thermal ions are first accelerated to speeds of 3 to 4 times the solar wind speed inside the CIR, presumably by some statistical mechanism, before reaching higher energies by a shock acceleration process. Our results also indicate that (1) the injection efficiencies for pickup ions are almost 100 times higher than they are for solar wind ions, (2) pickup H + and He + are the two most abundant suprathermal ion species and they carry a large fraction of the particle thermal pressure, (3) the injection efficiency is highest for protons, lowest for He + , and intermediate for alpha particles, (4) both H + and He + have identical spectral shapes above the cutoff speed for pickup ions, and (5) the solar wind frame velocity distribution function of protons has the form F(w) = F 0 w −4 for 1 〈 w 〈 ∼5, where w is the ion speed divided by the solar wind speed. Above w ∼ 5‐10 the proton spectrum becomes steeper. These results have important implications concerning acceleration of ions by shocks and CIRs, acceleration of anomalous cosmic rays, and particle dynamics in the outer heliosphere.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JA01509
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 8
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    Solar wind from the coronal hole boundaries
    American Geophysical Union (AGU) ; 2005
    In:  Journal of Geophysical Research: Space Physics Vol. 110, No. A4 ( 2005-04)
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 110, No. A4 ( 2005-04)
    Abstract: Recent studies using in situ observations established that the interface between fast and slow wind in interplanetary space has two distinct parts: a smoothly varying boundary layer flow that flanks fast wind from coronal holes and a sharper plasma discontinuity between intermediate and slow solar wind. Other studies using in situ observations and modeling have demonstrated the existence of the sub‐Parker spiral structure of the heliospheric magnetic field in which the magnetic connection between fast and slow wind created by foot point motion at the Sun deforms field lines, making them significantly less transverse than the Parker spiral. Here we model the formation of corotating interaction regions, and by including a coronal hole boundary layer (CHBL) and magnetic foot point motion across the coronal hole boundary back at the Sun we explain the detailed, characteristic variations in composition and magnetic field orientation observed in interplanetary space. Our model accomplishes this using only two free parameters, with all other quantities derived directly from solar wind observations. Through the model we trace the observed interplanetary variations back to an intrinsic two‐part structure in the source of solar wind at the Sun. These parts are (1) a CHBL that encircles the coronal hole and has a smooth transition in the source properties that produce the fast through intermediate speed (∼600 km s −1 ) solar wind and (2) a sharp coronal hole discontinuity separating the distinct sources of solar wind with intermediate speeds and temperatures from slow solar wind. This study establishes the connection between the characteristic variations of the solar wind speed, charge state composition, and magnetic field orientation observed in situ near 5 AU with their sources in the two‐part structure of coronal hole boundaries back at the Sun.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2004JA010896
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2005
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  • 9
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    Magnesium isotopic composition as observed with the CELIAS/MTOF experiment on the SOHO spacecraft
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Space Physics Vol. 103, No. A11 ( 1998-11), p. 26805-26812
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 103, No. A11 ( 1998-11), p. 26805-26812
    Abstract: Solar wind abundance ratios of magnesium isotopes measured with the high resolution Mass Time‐of‐Flight spectrometer (MTOF) of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO) are presented. MTOF, as part of CELIAS, is, because of its high time and mass resolution, an excellent tool for isotope abundance measurements in the solar wind. From the data analysis we have found that the isotopic composition of magnesium in the solar wind agrees with the terrestrial composition within the experimental uncertainty. We have obtained isotopic ratios of 24 Mg/ 25 Mg = 7.7 ± 0.4 and 24 Mg/ 26 Mg = 7.0 ± 0.5. These values are consistent with the terrestrial values of 24 Mg/ 25 Mg = 7.90 ± 0.01 and 24 Mg/ 26 Mg = 7.17 ± 0.03. Furthermore, these investigations also show that with the given uncertainties the abundance ratios do not vary significantly within a solar wind velocity range from 375 km/s to 530 km/s.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JA02542
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    detail.hit.zdb_id: 2220777-6
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    SSG: 16,13
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  • 10
    Online Resource
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    Auroral helium precipitation
    American Geophysical Union (AGU) ; 1972
    In:  Journal of Geophysical Research Vol. 77, No. 34 ( 1972-12-01), p. 6724-6730
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 77, No. 34 ( 1972-12-01), p. 6724-6730
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA077i034p06724
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1972
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    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
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    SSG: 16,13
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